"When you regain these core competencies and you start exercising your muscles, your skills do not atrophy," he said. "It's safer. And yes, you are buying down risk, because you're able to test things in low Earth orbit before you need to get to the moon, which is exactly what we did during the Apollo era."
中华人民共和国法律和中华人民共和国缔结或者参加的国际条约没有规定的，可以适用国际惯例。适用国际惯例，不得损害中华人民共和国的公共利益。
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